18361965 has 8 divisors (see below), whose sum is σ = 29379168. Its totient is φ = 9793040.

The previous prime is 18361963. The next prime is 18361969. The reversal of 18361965 is 56916381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18361965 - 2¹ = 18361963 is a prime.

It is a super-2 number, since 2×18361965² = 674323517322450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612051 + ... + 612080.

It is an arithmetic number, because the mean of its divisors is an integer number (3672396).

Almost surely, 2^18361965 is an apocalyptic number.

18361965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18361965 is a deficient number, since it is larger than the sum of its proper divisors (11017203).

18361965 is a wasteful number, since it uses less digits than its factorization.

18361965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224139.

The product of its digits is 38880, while the sum is 39.

The square root of 18361965 is about 4285.0863468546. The cubic root of 18361965 is about 263.8191915082.

The spelling of 18361965 in words is "eighteen million, three hundred sixty-one thousand, nine hundred sixty-five".